Fuel pressure loss at high rpm
05-06-2018, 06:20 AM
#31
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If you ran a pick up hose straight to a gas can then that would rule out a pick up issue. Carb issue would be unlikely. I would probably buy a cheap mechanical gauge and just verify it like that even though younswapped sending units and gauges just to rule out some sort of weird reference voltage issue to
that gauge. I would swap the whole sea water pump assembly and belt next. Belt slipping only at higher load/rpm?
that gauge. I would swap the whole sea water pump assembly and belt next. Belt slipping only at higher load/rpm?
Good job on your troubleshooting though. Swapping the sea pump/fuel pump to the other engine sounds like the best idea at the moment. Good luck!
05-06-2018, 02:07 PM
#34
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Wish I liked a cheaper less frustrating hobby like meth😂. I agree. That will be my next move. Thanks again!
05-07-2018, 06:17 AM
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Dealing with something very similar on two built 509's. We are just getting into the troubleshooting this week. 4500-5000 fall flat and will not make power. Airtex 60932 pump with the KE fuel pump upgrades. Engines made 676 hp at 6200 and 658 tq at 4700.
05-07-2018, 09:00 AM
#36
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I chased a fuel delivery issue for more time than I care to remember. Have done the KE pump lower with the Airtex upper etc. etc. Even though the cam lobe "looked" alright on the original seawater pump housing it was narrowed down to the problem just about had to lie there. Replaced the seawater pumps with Hardin Marine 624-4118 and am using CV products SPIN-MP 2616 fuel pumps. So far problem solver and no issues. Best thing is both pumps can be rebuilt.
Mark
Mark
05-07-2018, 09:06 AM
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I chased a fuel delivery issue for more time than I care to remember. Have done the KE pump lower with the Airtex upper etc. etc. Even though the cam lobe "looked" alright on the original seawater pump housing it was narrowed down to the problem just about had to lie there. Replaced the seawater pumps with Hardin Marine 624-4118 and am using CV products SPIN-MP 2616 fuel pumps. So far problem solver and no issues. Best thing is both pumps can be rebuilt.
Mark
Mark
05-07-2018, 03:34 PM
#38
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I chased a fuel delivery issue for more time than I care to remember. Have done the KE pump lower with the Airtex upper etc. etc. Even though the cam lobe "looked" alright on the original seawater pump housing it was narrowed down to the problem just about had to lie there. Replaced the seawater pumps with Hardin Marine 624-4118 and am using CV products SPIN-MP 2616 fuel pumps. So far problem solver and no issues. Best thing is both pumps can be rebuilt.
Mark
Mark
I tried the airtex as well but didn’t like how the ke fit with it. I’m going to swap water pumps out with other engine to see if the problem follows. The more I’m reading, the more confident it may be the culprit. You wouldn’t suggest just changing water pumps, but fuel pumps too? I’ve always heard good about the KE lower.
05-07-2018, 03:37 PM
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Dealing with something very similar on two built 509's. We are just getting into the troubleshooting this week. 4500-5000 fall flat and will not make power. Airtex 60932 pump with the KE fuel pump upgrades. Engines made 676 hp at 6200 and 658 tq at 4700.
05-08-2018, 05:50 AM
#40
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Yes we went with the AFR 335 heads. I've been told that as well about the pumps. Just very strange how we didn't have any issues last year and now we do. I didn't get down there last night to mess with it, I hope to this evening.
